/*
 * Copyright (C) 2012 Google Inc.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package org.ros.zeroconf.node.internal;

import java.net.URI;
import java.util.concurrent.TimeUnit;

import org.ros.exception.RosRuntimeException;
import org.ros.master.uri.MasterUriProvider;
import org.ros.zeroconf.common.ZeroconfRosMasterInfo;
import org.ros.zeroconf.common.selector.ZeroconfServiceSelector;

/**
 * A {@link MasterUriProvider} which uses zeroconf for URI resolution.
 * 
 * @author Keith M. Hughes
 */
public class ZeroconfMasterUriProvider implements MasterUriProvider {

	/**
	 * The service selector for zeroconf.
	 */
	private ZeroconfServiceSelector<ZeroconfRosMasterInfo> masterZeroconfServiceSelector;

	public ZeroconfMasterUriProvider(
			ZeroconfServiceSelector<ZeroconfRosMasterInfo> masterZeroconfServiceSelector) {
		this.masterZeroconfServiceSelector = masterZeroconfServiceSelector;
	}

	@Override
	public URI getMasterUri() throws RosRuntimeException {
		// TODO(keith): get better protocol selection once rosjava supports
		// other protocols
		return masterZeroconfServiceSelector.getService().getUri("http");
	}

	@Override
	public URI getMasterUri(long timeout, TimeUnit unit) {
		ZeroconfRosMasterInfo masterInfo = masterZeroconfServiceSelector
				.getService();
		if (masterInfo != null) {
			// TODO(keith): get better protocol selection once rosjava supports
			// other protocols
			return masterInfo.getUri("http");
		} else {
			return null;
		}
	}
}
